It’ll be a year and a half the next Olympic Games are held in London in .A. sinceB.

问题补充：

It’ll be a year and a half the next Olympic Games are held in London in .

A. since

B. when

C. before

D. until

答案：

A. since

B. when

(答案→)C. before

D. until

解析：这题考查句型：It will be+一段时间+before…句意是：要一年半下届奥运会就在伦敦举办了。选C。